diff --git a/xpdevplus.h.in b/xpdevplus.h.in
index 1241b356c4377b25789edfc340484e9f076f47de..dcb0204ac5e5f0dc4a221a64a28e752021be8192 100644
--- a/xpdevplus.h.in
+++ b/xpdevplus.h.in
@@ -5,7 +5,7 @@
 #cmakedefine N_CURSES_LIB
 #cmakedefine HAS_INTTYPES_H
 #cmakedefine HAS_STDINT_H
-#cmakedefine LINK_LIST_THREADSAFE
+#define LINK_LIST_THREADSAFE
 #define DISABLE_MKSTEMP_DEFINE
 #define BUILD_WITH_MINGW_COMPAT